FR: Document units for TFR objects and adjust/track depending on baseline correction #8026
Description
Came up in this gitter thread.
Describe the problem
The units for common TFR objects like AverageTFR are unclear.
Describe your solution
The units should be tracked ... and adjusted when a baseline correction is performed
Additional context
Other MNE functions track the units as well, and the colorbars or ylabels in plots are labelled with the units ... this is not the case for TFR objects yet.